Thank you every body for all information,So in summary:1. I must obtain a step-up dc-dc converter, I found this on ebay (hope link stilla live):2A booster board DC-DC step-up module2. I must limit the 2A current to 500mA as in the battery specification. But how? Could anyone please give a tutorial link or anyway point me to the right direction please?Maybe there is also a current limiting device on ebay and I just don't know what it is called?Edit:I found such item:current limiter chipAs I understand, the current limiting fucntion is specified by the R-set resistor that will be implemented in the schema realization of this chip, right? Could I do better, or this is the right choice please?
So in summary: